Sewing-machine thread cutter



July 12, 1949. slLvERMAN 2,476,161

SEWING MACHINE THREAD CUTTER Filed Sept. 29, 1947 INVENTOR.

7 BY v NFV Patented July 12, 1949 UNITED S TATES ?ATENT O F F 1 CE SEWING-DIACHINE THREAD :CUTTER Max Silverman, Forest Hills, N. Y.

Application September 29, 1947, SerialNo. 776,707

4 Claims.

lhis iiivention-relates-to asewin'g machine device for severing thethreads at-the termination of the sewed stitch, and its principal object is to provide an improved device for this purpose which will be conveniently and economically manufacturable, saleable at low cost, strong, durable, reliable, and conveniently and efiiciently utilizable.

Another object is to provide an improved and efficient device for this purpose which will be conveniently installable upon the sewing machine, without requiring any mechanical alteration of the machine.

A further object is to provide an improved and efiicient device for this purpose having means for its adjustment to cutting off of sewing threads of varying strengths and thicknesses.

Other objects and advantages will hereinafter appear.

In the accompanying drawings- Fig. 1 is an elevational view of the sewing machine device constituting the invention, illustrating it as it appears when in operative installed state upon the machine.

Fig. 2 is a top plan view of the device shown in Fig. 1.

Fig. 3 is a transverse cross-sectional elevational view of the device. taken on line 33 of Fig. 2.

Fig. 4 is an elevational view of the device as it appears prior to installing it on the sewing machine, and as seen rearwardly of the view shown in Fig. 1.

The device I includes a metallic plate 2 having a flared end portion 3, and in its opposite end portion a hole 4, said plate carrying a projecting pin 5 and having a hole 6 between the pin and the end portion 3. Against the plate 2 is located a hard-metal plate 1 provided with a sharp cutting edge 8, and having a reversely flared end portion 9 with holes l0, H which register with the hole 6 and pin 5 respectively, the hole I I being slidable over the pin 5. A screw l2 passes through the holes 6, l and threads through a nut I3 located against the cutter plate I, and a spring [4 coiled around said screw bears against its head I2a and against the plate 2. The cutter plate 1 is thus mounted in place against the plate 2 and is guidable toward and away from the plate by the screw I2 and pin 5, while it is normally maintained in tensional contact with the plate 2 by the nut I3 which draws it to the plate by the action of the spring 14 against the screw head lZa. Threading of the screw l2 into and outwardly of the nut l3 varies the tension of the Y 2 spring M and therethrough the tensional contact of-the cutter plate 1 with the plate2.

The device I is installed on the sewing machine ill by passing through the hole 4 the set screw 58 which secures the presser foot I! to its operating rod l8, and tightening the screw l6 against the plate 2, in which manner the device I is firmly fastened to the presser foot I! and disposed away therefrom and from the operative, as illustrated in Fig. 1. In operation of the device, the operative brings the sewing threads l9 emanating from the completed stitch into the bight of the flared portions 3, 9 and between the plates 2, I, and severs said threads over the cutting edge 8 of the plate 1, the screw I2 having been previously adjusted to apply the desired tension between the said plates, in accordance with the strength or thickness of the used sewing threads Variations may be resorted to within the scope of the invention, and portions of the improvements may be used without others.

Having thus described my invention, I claim:

1. For a sewing machine embodying a presser foot, a rod for carrying said presser foot, and a screw securing the presser foot to said rod, of a thread cutting device having the combination of a member provided with a hole for therethrough passing said screw for securing the member to the presser foot, a cutter contacting with said member, said cutter and member having means to guide the cutter toward and away from the member, a spring drawing said cutter to said member, means to vary the tension of said spring, and the conjoint end portions of said cutter and member being flared to facilitate passing of the sewing thread between the cutter and the member and for severing of the thread by said cutter.

2. For a sewing machine embodying a presser foot, a rod for carrying said presser foot, and a screw securing the presser foot to said rod, of a thread cutting device having the combination of a member provided with a hole for therethrough passing said screw for securing the member to the presser foot, a cutter contacting with said member, a pin fixed to said member passing through said cutter to guide the cutter toward and away from said member, a screw passing through said member and cutter to additionally guide the cutter toward and away from the member carrying a nut against the cutter, a spring coiled around said screw drawing said nut to said cutter and the cutter against said member,

the threading of said screw in said nut varying the tension of said spring and of the cutter against said member, and said cutter and member having means to facilitate bringing the sewing thread between them.

3. A thread cutting device for a sewing machine having the combination of means for securing it to a sewing machine part, a member and a cutter contacting with each other, a pin fixed to said member passing through said cutter to guide the cutter toward and away from the member, a screw passing through said member and cutter to additionally guid the cutter toward and away from the member carrying a nut against the cutter, a spring coiled around said screw drawing said nut to said cutter and said cutter against said member, the threading of said screw in said nut varying the tension of said spring and of the cutter against said member, and said member and cutter having means to facilitate bringing the sewing thread between them.

4. A thread cutting device comprising means for securing it in operative state, the device having a member and a cutter contacting with each thread between the cutter and said member.

MAX SILVERMAN.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS 20 Number Name Date 1,396,066 Seely Nov. 8, 1921 2,296,190 Runge Sept. 15, 1942 

